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P. A. PRATT. SEWING MACHINE.

N01. 60,418. Patented-B00511;1866.-

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TO ALL WHOM IT MAY; CONCERN: Be it known that I, FRANCIS A. PRATT, of the cityand county of Hartford, and State of Connecticut, have invented a certain new and useful Improvement in Sewing-Machines; and to enable others skilled to make and use the same I will proceed to describe the same, referring to the drawings, in which the same letters indicate e like parts in each of the figures.

The nature of the improvement will be understood from the specification and drawings. It relates particularly to the mode of constructing and adjusting the cross-head, or shuttle-driver, to the ways, in order to produce and secure a close, continuous, yet free and easy motion to the cross-head upon its ways, relative to its driving-shaft, and to compensate for the wear and tear thereof. Small defects in the working of a delicate machine (as a sewing-machine) creates great discouragement inthe mind of inexperienced operators, and not unfrequently a good and perfect machine is for such acailse condemned or laid aside. Ord i narily the ways upon which the shuttle-carrier or cross-head is fitted are quitenarrow, rendering it necessary to have an arm extend down from the lower edge of the cross-head some distance, in order tobring the centre of its operating-pin in a line with the centre of driving-shafflor parallel with the upper surface of the bedplate, thus rendering it'liable to a cramping or binding action or efi'ect; and this tendency naturally will, increase with its use and wears To avoid this tendency, and to furnish simple and efi'ective meanswhereby-the driver may be easily and quickly adjusted to work freely and easily upon the guide-ways when required, (from wear or other causes,) is the object of this invention.

In order to show more clearly how this improvement is efl'ected I willproceed to describe. Figure 1 is a top or plan view. Figure 2 is an underside view. Figure 3 is a section view.

Figure 4 shows a side view of the cross-head and way upon which it is arranged and the position of the shaft,

connecting-arm and connecting-pins relative to each other.

a is the cross-head or shuttle-driver; c is the way upon which the cross-head is arranged and works; (1 is a gib or shoe arranged within the cross-head a for the purpose of adj usting said cross-head to the way, and to render it easy and simple of adjustment when desirable by simply turning one or two set-screws, e. This crosshead is made broad, so as to bring the centre of the connecting-pin g closer to the line or edge of the'way c, andat the same time to be in a line through the centre of the shaft 71. and in a parallel line with the face of the bedplate 1'. k is a crank, securedupon the end of the shaft k; n is a connecting-arm, by means of which motionis transmitted from the shaftthrou gh the crank it and arm n to the cross-head a. The bracket or carrier 0, which holds and actuates the shuttle, is secured upon one'edge of the cross-head a. Now, if this cross-head be fitted to the way a without the use of the gib d it will very soon work loose; and if its point'of connection with the arm 'n be extended (as is usually the case) from the hearing or edge of the way 0 the tendency to wear, work,

loose, and rattle, is greatly increased. Now,'by increasing the width of the cross-head,-and thereby shortening its connecting-arm, and employing the gib 41, this liability is removed and good facility provided for adjusting,

and the perfect working of the cross-head or shuttle-driver secured.

I believe I have thus shown the nature, construction, and advantages of this improvement, so as to enable others skilled to make and use the same therefrom.

What I claim, therefore, and desire to secure by Letters Patent, is

The employment of the gibor shoe d and cross-head a, with the way 0, substantially as and for the purpose described. v i

FRANCIS A. PRATT. [L. 5.]

Witnesses:

ANNIE L. S'roNa,

JEREMY W. Buss. 

